Guide for riveting machines



Sept. 2, 1924. 1,506,788

E. B. STIMPSON GUID FOR RIVETING'MA HINES Filed July 19 1922 Fig. 1- 32- 14 m 19 4F 25 MINI 23 ly 2' A 25 TATES PATENT QFFEQE,

EDWIN B. STIMPSON, OF BROOKLYN, NET/V YORK, .ASSIG-NOR TO EDWIN B.STIMPSON COMPANY, OF BROOKLYN, NEW YORK.

GUIDE FOR BIVETING MACHINES.

Application filed July 19, 1922.

To all 70/ 30111 it may concern.

Be it known that I, EDWIN B. STIMPSON, a citizen of the United States,residing at- Brooklyn, in the county of Kings and State of New York,have invented certain new and useful Improvements in Guides for RivetingMachines, of which the following is a specification.

This invention relates to riveting machines and particularly to theguiding of the rivets as they are being driven.

In some cases, and particularly with rivets having heads of relativelylarge diameter and appreciable height with comparatively small, shortshanks, there is a tendency for the rivets to tumble and even turncompletely upside down. This tendency is increased where the head of therivet is not absolutely round, as is often the case.

The principal objects of the invention are to overcome this tumblingeffect and to guide and hold the rivets under proper control during thedriving operations.

These objects are attained in the structure disclosed in theaccompanying drawing forming part of this specification, whichillustrates but one of the novel embodiments the invention may take.

Figure 1 is a front elevation of the head of a riveting machine havingthe invention incorporated therein, the front rivet guide being omittedto show a rivet in position behind the same.

Figure 2 is a partial vertical sectional view on substantially the planeof line 2-2 of Figure 1.

Figure 3 is a similar view, illustrating the spreading of the guidesunder the driving action of the plunger.

Figure 4? is an enlarged plan view of the rivet guides, as taken onsubstantially the plane of line 4. 4- of Figure 1.

Figure 5 is a similar view of a modified form of the guides.

In the illustration 6 designates the head portion of a riveting machineand at 7 are shown the rivets which travel in an inclined chute 8 andare released by the cross slide 9, one by one, to the cooperating guides10 and 11 in position beneath the plunger 12.

The guides are shown as supported by spring arms 13, 14 removablysecured to the slide 15 by bolt 16 and wing nut 17.

The opposing forward edges of the guides,

Serial No. 575,947.

facing the lower end of the chute are shown as cut away on convergentangles at 18 to form an entrance for the shank of the rivet and the topsof the guides are shown as cut down to form a pocket 19 of a size andshape to receive and steady the head of the rivet.

Below the head receiving pocket the guides are shaped to provide asubstantially cylindrical passage 20 of slightly smaller diameter thanthe head of the rivet, terminating in a contracted conical portion 21which leads to a cylindrical passage 22 substantially the size of theshank of the rivet.

A special feature of the invention is the construction of the guideswith ridges or the like to operate as holding fingers, which by grippingthe rivets at separated points will overcome the twisting or tumblingtendency.

In the first form of the invention, F ures 1 to 4, the guides are shownas longitudinally grooved in their opposite faces at 23, 9/1 and ashaving their edges reduced or cut away at 25, 26 at a pointdiametrically opposite the entrance way 18 for the rivet shanks, thusproviding the four seg ments 2?, 28, 29, 30 extending from the top ofthe guides to the shank guiding outlet 22 at the bottom thereof tooperate as separate longitudinal guide fingers.

It will be seen that as the plunger descends, the guides beingyieldingly sup-- ported, will spread as indicated in Figure 8, and thatin the downward travel the head of the rivet will be gripped at fourequally separated points and the rivet 'ill therefore be driven straightand true, irrespective of any inequalities or irregularities in theshape of the head. The straightening effect is particularly exerted at atime when most needed, that is, when the rivet is approaching the end ofits travel, as in Figure 3, when the head rides down over the lower,inclined or convergent portion of the fingers at 21. These convergentpor tions of the lingers, it will be seen, make it practicallyimpossible for a rivet to turn or tumble at this time, and if the rivethas already started to turn they operate to antomatic-ally straighten itand send it on its true course to the anvil 31.

As one of the possible modifications of the structure I have shown inFigure 5 how practically the same guiding effect may be obtained byconstructing the cooperating guides with a substantially rectangularpassage 32 in place ofthe cylindrical passage, with a convergentpyramidal portion 38 at the lower end thereof having a rectangularoutlet 34. Substantially semi-cylindrical grooves 36, 37, 38 out in thefour walls of the rectangular passage provide a series of ridges oredges 39 which will operate as longitudinal guide fingers, holding therivet under control and keeping it in a straight course.

What I claim is:

1. In a rivet guide, cooperating guide members constructed and arrangedto pro videbetween them a rivet passage, the opposing faces of saidguide members having separated longitudinally extending ridges formingguide fingers to hold the rivet heads at separated points during thedriving op erations, and the guide members having matched cut-awayportions defining a lateral opening through which the shank of a rivetmay enter between the guides.

2. In a riveting machine, a plunger and a cooperating anvil, means forfeeding the rivets into position beneath the plunger,

cooperating spring pressed rivet guides and the guide having matchedcut-away portions defining a lateral opening through which the shank ofa rivet may enter between the guide, having a pocket at the top thereofto receive'the rivet heads, said guides having a rivet passage betweenthem extending downward from the pocket and con-' tracted toward thelower end thereof, the

ture.

EDWIN B. srrnrson.

In testimony whereof I affiX my signa-

